package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        /*// TODO 后期需要进行md5加密，然后再进行比对
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }*/
        // 对密码md5加密后比对
        password =DigestUtils.md5DigestAsHex(password.getBytes());
        if(!password.equals((employee.getPassword()))){
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }



        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }


    /**
     * 新增员工
     * @return
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee=new Employee();
        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO,employee);

        //设置帐号状态，1正常，2禁用
        employee.setStatus(StatusConstant.ENABLE);

        //设置密码,MD5加密
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //设置记录的创建时间和修改时间


        //employee.setCreateTime(LocalDateTime.now());
        //employee.setUpdateTime(LocalDateTime.now());

        //设置当前记录的创建人和修改人id
        //TODO
        //employee.setCreateUser(BaseContext.getCurrentId());
        //employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.insert(employee);

    }

    /**
     * 分页查询
     * @param employeePageQueryDTO（name，page，pagesize）
     * @return
     */
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO){
        //select * from employee limit 0,10
        //开始分页查询,可以通过一个插件快速实现，字符串的拼接不用自己做了
        //为什么看起来PageHelper并没有给下面传递参数，却可以实现分页，因为pagehelper的底层代码中调用了一个ThreadLocal，将page和每页记录数存储了，再动态sql的时候在自动插入sql语句末尾
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());

        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO); //因为使用了pagehelper插件，所以这里的返回值要设置为page；
        long total =page.getTotal();
        List<Employee> records =page.getResult();
        return new PageResult(total,records);
    }

    /**
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //update employee set status = ? where id=?
        //传统创建对象方法
        /*Employee employee =new Employee();
        employee.setId(id);
        employee.setStatus(status);*/
        Employee employee =Employee.builder()
                        .status(status)
                        .id(id)
                        .build();
        employeeMapper.update(employee);
    }

    /**
     *
     * @param id
     * @return
     */
    public Employee getById(Long id) {
        Employee employee= employeeMapper.getById(id);
        employee.setPassword("******");
        return employee;
    }

    /**
     * 编辑员工信息
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        //employee.setUpdateTime(LocalDateTime.now());
        //employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

}
